package com.hmdp.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.Result;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.ISeckillVoucherService;
import com.hmdp.service.IVoucherOrderService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RedisIdWorker;
import com.hmdp.utils.UserHolder;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.aop.framework.AopContext;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.time.LocalDateTime;

/**
 * <p>
 *  服务实现类
 * </p>
 */
@Service
public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {
    @Resource
    private ISeckillVoucherService iSeckillVoucherService;
    @Resource
    private RedisIdWorker redisIdWorker;
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Resource
    private RedissonClient redissonClient;

    @Override
    public Result seckillVoucher(Long voucherId) {
        SeckillVoucher voucher = iSeckillVoucherService.getById(voucherId);
        if (voucher.getBeginTime().isAfter(LocalDateTime.now())) {
            return Result.fail("秒杀活动尚未开始!");
        }
        if (voucher.getEndTime().isBefore(LocalDateTime.now())) {
            return Result.fail("秒杀活动已经结束!");
        }

        if (voucher.getStock()<1) {
            return Result.fail("当前库存不足！");
        }

        //一人一单
        Long userId = UserHolder.getUser().getId();
        //SimpleRedisLock lock = new SimpleRedisLock("order:" + userId, stringRedisTemplate);
        RLock lock = redissonClient.getLock("lock:order:" + userId);

        boolean success = lock.tryLock();
        if(!success){
            return Result.fail("请勿重复下单！");
        }
        //获取代理对象(事务)
        try {
            IVoucherOrderService proxy = (IVoucherOrderService) AopContext.currentProxy();
            return proxy.createVoucherOrder(voucherId);
        }  finally {
                lock.unlock();
        }

    }

    @Transactional
    public  Result createVoucherOrder(Long voucherId) {

            Long userId = UserHolder.getUser().getId();
            Integer count = query()
                    .eq("user_id", userId)
                    .eq("voucher_id", voucherId).count();
            if (count >= 0) {
                return Result.fail("该用户已经购买过一次了！");
            }

        boolean success = iSeckillVoucherService.update()
                .setSql("stock=stock-1")
                .eq("voucher_id", voucherId)
                .gt("stock",0)              //该除更新数据使用乐观锁
                .update();

        if(!success){
            return Result.fail("库存不足");
        }

            VoucherOrder voucherOrder = new VoucherOrder();
            Long orderId = redisIdWorker.nextId(RedisConstants.VOUCHERORDER_KEY);
            voucherOrder.setId(orderId);

            voucherOrder.setUserId(userId);

            voucherOrder.setVoucherId(voucherId);
            this.save(voucherOrder);
            return Result.ok(orderId);

    }
}
